beaumont



V. BEAUMONT.

Steam Gage.

No. 11,743. Patented Oct. 3, T854.

. UNITED sTATps xTENT OFFICE.

VICTOR BEAUMONT, OF NEW YORK. N. Y.

STEAM-GAGE.

Specification of Letters Patent No. 11,743, dated October 3, 1854.

T 0 all whom it may concern:

Be it known that I, VICTOR BEAUMONT, of New York, in the county of New-York and State of New York, have invented a new and useful Instrument for Measuring the Pressure of Steam, Gas, or Liquids, which I name the Self-Compensating Gage, and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the anneXed drawings, making a part of this specification, in which Figure 1,is a perspective front view. Fig. 2, is a transverse section. Fig. 3, avariety of the instrument described, and Fig. 4, detail.

The nature of my invention consists in using a flattened sphere A, Fig. 4, provided with a pipe B through which the steam rushes inside the sphere, and to measure the pressure by the degree of inflation of the sphere. The sphere is fastened on a frame as indicated Fig 1 and Fig. 2 in C by one of its depressed poles, the other pole plays by the action of the steam and this play properly measured indicates the pressure of the fluid introduced into the instrument.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

Figs. 1 and 2 represent an instrument in which a number of flattened spheres D D D D,, &c., have been fastened upon each other, all communicating together and through the pipe B with the boiler. Each sphere will play individually, but as the whole system is fastened to the frame in one place only, namely in C, the play of the extremity D will be equal to the sum of the plays of each individual sphere, added together. This extremity will by means of the thread E, E, and the pulley F, act upon the cam G. This cam of one piece with the large pulley I-I will communicate its motion to the pulley I and the hand K will mark that motion on the dial L, L. The divisions on the right indicate the number of pounds above the atmospheric pressure. The division on the left indicate the number of pounds below it, consequently on this side the hand can go but a little farther than fourteen pounds, or perfect vacuum.

The play of the extremity D, is not proportional to the amount of pressure inside, that is to say, if the first pound above the atmospheric pressure, makes it play one tenth of an inch, the second pound will make it play, perhaps, only onet-wentieth of an inch. The object of the cam G, is to counteract these differences, so as to make the hand move the same number of degrees for the same variation of pressure, whatever the initial pressure may be. To obtain this desideratum the cam G is so shaped and so placed as to act through its longest radius when the motion of the spheres is longest and as to act through decreasing radii when the length of the motion in D,

for a constant difference of pressure, de-

creases. A spiral spring R or equivalent, draws constantly on the pulley I in an opposite direction and forces the various pulleys, the cam and the hand, to obey the motion of the extremity D.

The tubes M, M, are used instead of a center tube, to obtain room for the axis of the hand K to pass.

The object of the combination of flattened spheres is twofold, it is not only to multiply the eifect as stated above, but it is also to render the instrument more reliable than one in which only one element, whatever its principle may be, is used to produce the de-' sired result. In Fig. 1 and Fig. 2 there are represented eighteen flattened spheres for a single instrument, any defect in' the construction of one of them, will produce only one eighteenth part of the error it would if that sphere alone were used, and moreover there may be a contrary defect in another sphere by which the eifect of the first is counterbalanced.

The flattened spheres may be made not only more or less flat, but even one hemisphere may be reversed inside the other: It may be made round or in a conical shape. Fig. 3 is an illustration of a shape proper, when it is found desirable to use a large number of flattened spheres without occupying much room. In this case the metal of the exterior cone N of each sphere is extended and that of the interior cone P is compressed by the action of the steam. I do not limit myself either to using it only as a steam gage, since by simply making a vacuum inside and perfectly closing the tube B, it would act as a barometer, and since it may be used to measure the pressure of any kind of fluid besides steam.

I do not claim the elastic metallic disk or combination of several of them, as I have conical surfaces combined together so that learned lately it has already been used. When the pressure is extending the one'it is But compressing the other.

What I do claim as my invention and dea V. BEAUMONT. 5 sire to secure by Letters Patent is lVitnesses:

The peculiar variety of the shape of the ANN MELLIN, so-called flattened spheres, consisting in PHILIP I. IRAGHIMSY. 

